Please update your client(s) to 1.10.6 or later as ZT 1.10.4 on Windows created duplicate firewall rules.
After updating, clear the duplicated rules by leaving and re-joining your networks.
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A tip for ZeroTier on Windows power users → To clean up the rules in an Admin powershell, try:
Remove-NetFirewallRule -DisplayName "zerotier-icmp*"